Hydraulic jack



Oct- 26, 1948. J. J. MUELLER 2,452,482

HYDRAULIC JACK INVENTOR.

Jza .JZ/Q2@ MMM/M Oct. 26, 1948. I J. J. Mur-:LLER 2,452,482

' HYDRAULIC JACK Filed May 15, 1944 2 Sheets-Sheet 2 e 74 l `W @0 .56

j@ j 10 ad y Patented Qct. 26, 1948 HYDRAULIC JACK Joseph J. Mueller,St. Joseph, Mich., assigner to Auto Specialties Manufacturing Company,St. Joseph, Mich., a corporation of Michigan Application May 13, 1944,Serial No. 535,436

12 Claims.

This invention relates to hydraulically'operated pushing and pullingdevices, and more particularly to hydraulic jacks for lifting relativelyheavy loads.

Among the objects of the present invention are to provide an hydraulicjack that is composed of a minimum number of parts, each of simpleconstruction, the parts being designed to be capable of economical andready manufacture and easily assemblable into an operable hydraulicallyoperated jack structure.

Further objects of the invention are to provide an hydraulic jackincluding `a base suitably formed to provide a ram cylinder and asurrounding reservoir and provided with but one additional boreextending to the exterior of the base for the purpose of receiving acombined high pressure pump cylinder and release valve, the jackincluding mechanism for reciprocating the piston of the pump in the pumpcylinder and for longitudinally sliding, without turning, the highpressure pump cylinder for the purpose of closing the release valve uponits seat, the closing mechanism being constructed and arranged so thatupon release movement thereof the high pressure pump cylinder will bereleased for shiftable movement in a reverse direction, whereby thepressure in the ram cylinder will eiect an unseating movement of therelease valve to relieve the liquid from the ram cylinder back into thereservoir; to provide a simple and economical manner of forming acombined high pressure pump cylinder with its reciprocable piston,together with a valve cage unit and release valve operable as a unit andshiftable without turning, parallel to its own longitudinal axis andwherein the piston is capable of easy pivotal connection to the pistonreciprocating mechanism, and wherein the cylinder is capable of easyconnection to mechanism pivoted on the base for sliding the cylinder,the Valve cage and therelease valve relatively to a valve seat formed inthe base for controlling the relief of the ram cylinder; to providethese and other objects of invention, as will be apparent from thefollowing specication when taken in connection with the accompanyingdrawings, wherein:

Figure l is a front elevation of one form of my improved jack;

Figure 2 is a side elevation thereof;

Figure 3 is a plan view thereof;

Figure 4 is a section on the line l-d of Figure 2;

Figure 5 is a perspective View of the high pressure pump cylinderpiston, ball valve cage unit,

2 and release valve, with the connection to the shifting vmechanismtherefor;

Figure 6 is a detail fragmentary sectional view showing the Valve cageand release 'valve 'shifted te 'closed position on its seat; and AFigure '1 is a section taken on the 'line i--l of Figure 6.

Referring new to the drawings in detail., the jack preferably comprisesfa 'base 2 'herein shown as formed with a well '4 havingup'sta'r'rd'i'ng, i'nternally threaded Walls 'G cohceiit'rically sui"-roundingr the Well 'and 'adapted to recive the lower, externallythreaded ends of the lc ylind'er 8. In addition, the ba'se 2 isprovidedwth 'a concentri'cally surrounding sh'uld'ered and countersunkportionl ID which recfvs A'ad'l'li tional sleeve l2 "fc'rming the liquidrese'ryclr r4 between it and the cylinder 8. The j'linetin between theshoulder it and the lower portion of the sleeve I2 is' a press t 'whichis in addition wel-deu 'so as to iorm a very secure union. I

A headr I6 'O'irnS a Welded press fit jllctioh r"i8 with the outer'Sleeve I2 "and irl addition the inner Wall of this head is threaded asat 2li to receive the threaded external walls 'of 'the ram cylinder 8.The 'inner annular surface 2v2 of 'the head is coredout or cut 'out as"at y22 to provide an nil 'chamber and the usual type or vplanung andthe usual threaded washer 2E` is thre'fdedly connected to the top of thehead IG t'o hold the packing in position fso 'that' the ram '28 mayreciprocate through the packing withl'it'leaka'lge of oil thereby. `Theupper fend of the ram "is pro-v vided with the load S'libprt 30A, andthe 16u/'erelid of the ram is provided with the usual sealing ring 32formed of leather yer other flexible material 'and held inpla'c'e by'-r'neans of the usual fastening member 34, as `i's 'well known in theart.

The base is 'prv'ided with one additional bring or 'opening which'extends to 'the eiterior of the base, and this comprises 'the bore 3'5which 'receives 'the high pressure pump cylinder, the pistonreciprocable therein, the unitary ball valve cage and release valve. yNo`other ccnduit 'formed in the base eXten'ds to the eXteri'I" of thebase, thereby keeping leakage 'to a min-imum Ihe basal ycasting isprovided 'with a conduit 3'8 which connects with 'the 'well d.. passage38 is formed in the base l2 'at such an angulfarity that its projectionpasses above the upper surfaces 'oi the base so that when the ramcylinder 8 and reservoir cylinder wall l2 are removed from the base, the'conduit 38 may be bored fbir'l the upper face ci the base. The 'outerend of this conduit connects with another short conduit 48, the centerinder, when the release valve is raised from its'Y seat. It will thus beseen that the bore 44 and the valve seat 43 all connect with the bottomof the bore36. y .Y

The basal casting at one side of the cylinder` l2 is provided with anupstanding projection 46 about the bore 36, and this projection-45 isprovided with an opening 50 to receive a pivotal pin 52 as hereinafterdescribed. v

The high pressure pump cylinder is formed in a novel manner. It isformed of a short length of steel tubing, preferablyformed by cutting along steel tube into requisite lengths to correspond with the length ofthe high pressure pump cylinder desired. The steel'tubing is given ahigh finish interiorly, preferably before it is cut into lengths, sothat no further interior finish need be imparted to the high pressurepump cylinder, which'will reciprocatingly receive the high pressure pumppiston without further finishing operation. Thus the high pressure pumpcylinder 54 is formed in an appropriate length of steel tubing, as shownin Figure 5. It is round in cross section'and receives, with a tight litat its upper end, an annular ringl or head 56 which ring is closed atboth ends, one of the ends receiving a threaded nut 58 to press apacking 6| Within the annulus, tightly against the piston 62 which isadapted to-reciprocate throughv the sleeve-like cylinder 54 and head 56.The head is preferably provided with two outstanding diametricallyopposed studs 68, and this headis adapted to make a tight wedgingorwelded fit with `the upper end of theouter'surface. oi" the sleeve 54while reciprocatingly receiving the piston 62 therethrough. The outerend ofthe piston is provided with a slot' 64 to receive in theusual-manner theconnecting pin 66 connected bya yoke 68 to thek handlewhich receives the reciprocable handle bar 12. rThe inner end of thishandle socket A'lll is pivoted as at 14 to 1an outstanding ear 'I6formed on the sleeve I2. AThe inner end of the handle bar 12 isnotchedas at 78 to engage the valve shifting mechanism,'as hereinafterset forth.y

The lower partof the piston is provided with the usual sealing washer88, 'as is well known in the art, the same being held in position bymeans of the screw 82.

s Theextreme lower end 'of the high pressure pump cylinder 54 makes atightt with a countersunk shoulder 86 formed ona unitary ball valvecage, the details of which are 'shown more clearly in Figure 6; Thisball valve cage comprises a ported member or ported means havinginternal valves governing passages which are adapted to connect thepassage 44 leading to the reservoir with the piston chamber within thecylinder 54 so that when the piston moves outwardly, liquid will bedrawn through the port 44 into the port 88, thence into port 90,' pastball valve 92, into the piston chamber 94. Upon reverse movement of .thepiston, liquid will be forced through the port 96 past the ball valve98, through port |88, through port |83, into port 40, thence throughpassage 38 to the ram cylinder. The balls are held close to their seatby means of inserted wires |82.

The lower end of the ball valve cage is preferably provided as aseparate hard metal cap or valve member |0| having a central port |03therethrough and provided with abruptly shaped conical walls |84 of suchangularity as to seat upon the annular shouldered valve seat 43 with aminimum annular contact, whereby a tighter seating of the valve upon thevalve seat is provided, and thus closing any direct connection betweenthe ports 38, 48 and dll while permittingliquid to flow through the ballvalve cage, through the reservoir to the pump cylinder chamber, to theram cylinder. This member |ll| to this end isprovided with a countersunkshoulder the upper portion of which iits within a recess countersunkwithin the end of the ball valve cage and the i'lt is such that theupper face H5 of this release valve |8| is suiiiciently close to ball 98to hold it upon its seat. In addition, the ballvalve cage at the openingat which the ball valve 92 operates, is peened in as shown at |87 tohold the ball in position relative to its seat. Means is provided formanually shifting the combined structure'shown in Figure 5 whichcornprises the high pressure pump cylinder which rigidly carries theball valve cage 87 and the release valve I 04 therewith, to force therelease valve |04 to its seat 43. This means comprises mechanism which,without turning or permitting the turning of the high pressure pumpcylinder, shifts this high pressure pump cylinder, ball valve cage, andrelease valve in a direction parallel to the longitudinal axis of thisstructure so as positively to draw the release valve to its seat.Inaddition the structure is arranged so that upon a release movement,the liquid pressure which has been built up in the ram cylinder duringthe raising of the ram, will automatically force -this structure, whichincludes the release valve, from its seat and thereby relieve the ramcylinder pressure so that liquid will flow from the ram cylinder at well4 through the ports 38 and 49 through the open release valve, throughport 44, back to thereservoir. This means comprises a linkage mechanismwhich includes a type of bell cranklever |86 pivoted about the iixedpivot 52. kThis lever` includes an arm |88 internally threaded at i8 toreceive the screw i i2, the screw having at its inner end a roundedsurface ||3 and at its outer end the cross bars H6 by which it may beturned when contacted by the notch I8 in the inner end of thehandle 12.In addition the other end of the bell crank |06 includes the forks||4,there being two of them which are pivoted as at ||7 and ||8 to apair of links |2 and |22 which in turn are pivoted to the opposed,diametrical pins 68 outstanding from the head 56. The arrangement issuch that when the outer ends |16 of the screw |2 are turned in thecorrect direction, the bell crank-will shift about its fived pivotwherebyv to draw down upon the links |20` and cause the head 56 to bedrawn down whereby to likewsie shift the high pressure pump cylinder 54downwardly, ,thereby shifting the unitary ball valve cage and releasevalve formed now integrally with the lower portion of the pump cylinder,downwardly, Ato close the release valve upon its valve seat 43. When thescrew |52 is turned in the reverse direction it will release thisdrawing down action so that the pressure built up in the conduit 38 and,40 will now force the unitary structure 54, 8l, and |84 outwardly awayfrom the seat t'o relieve the ram Icylinder pressure. It will be notedthat this movement of the yhigh pressure pump cylinder is independent ofany re'ciprooable action of the v'piston 62 in the pump cylinder and istherefore independent of any re'ciproc'able position of the piston inthe pump cylinder. y

By 'the foregoing mechanism I .provide a very simple, economical, ruggedjack, which is composed of few parts, easily manufactured, easily andquickly assembled into a 'completely operative 'structure wherein therelease valve may be opened or closed from a point readily accessible onthe jack and without any involved interrelation with Ithe reciprocablepiston, and particularly by means of the present construction [I havereduced to a minimum number of .parts the mechanism for shifting thehigh pressure pump cylinder relatively to the base of the ack foraccomplishing the shifting of the release valve onto its seat andconversely for permitting 'the pressure in the ram cylinder to shift therelease valve from its seat automatically, In addition, it will be seenthat I have provided a simple means vfor manufacturing a high pressurepump cylirrder from steel tubing, completely finished within so as toreceive the high pressure pump piston without further finishingoperation, and I have provided means whereby the jack may be readilytaken apart to repair any Adefective operation 'ci the ball valves. Thisrepair work is accomplished in a very simple manner by disconnecting theoperating mechanism from the high pressure pump piston, removing it andthe cylinder from the base, so that the ball valve cage and releasevalve are exposed. If desired, 'the ball valve cage is readily removedfrom the lower end of the high pressure pump cylinder for repair orreplacement.

Obviously the invention is not limited to the specific details ofconstruction disclosed herein but is capable of other modifications andchanges without departing from the spirit and 'scope of the appendedclaims.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In an hydraulic jack having a base provided with a bore, said basehaving thereon a Tram cylinder, a liquid reservoir 'associated with saidbase, a pump cylinder comprising a sleeve of uniform cross sectionhaving a smooth exterior 'slidable in said bore, a ram for the ramcylinder, a piston reciprocable in the pump `f'zylin'd'er sleeve,yconduit means in the base interconnecting the reservoir, the pumpcylinder and the ram cylinder, ported and valved means carried by saidpump cylinder sleeve for transferring liquid through said conduit meansfrom the re'servoii1 t'o the pump cylinder, and from the pump cylinder'to the ram cylinder upon -reciprocation of said piston, release valvemeans including a valve seat formed in the base in association with`certain oi said ports and including a release valve carried by saidported and valved means and shiftable with said cylinder sleeve andported and valved means, and means connected with said 'cylinder andoperative from a point exteriorly of said base, vfor sliding said sleevein a direction parallel to its longitudinal axis While holding saidsleeve from rotation for closing said release valve upon its seat.

2. In an hydraulic jack, a base having a ram cylinder, a liquidreservoirand 'a pump vcylir-ider bore, a ram in the ram cylinder and a pumpcylinder slidable in said bore and a reciprocable piston in the pump"cylinder, yconduit means interconnecting the reservoir, the pumpcylinder and the ram cylinder, ported and valved means carried by saidpump cylinder for transferring liquid through said conduit means fromthe reservoir tothe pum-p cylinder, and from the pump cylinder to theram cylinder upon reciprocation of said piston, Arelease valve meansincluding a valve seat formed -in the base in association with certainof said ports and including a release valve carried by said ported andvalved means and slidable in said bore with said cylinder, and linkagemeanspivoted to said base and to said pump cylinder' and operable fromthe exterior of said base for sliding said cylinder longitudinally toclose said release valve upon its seat.

3. In an hydraulic jack having a base provided with a bore, a ramcylinder, a liquid reservoir associated with said base, a pump cylinderslidable in said bore, a ram in the ram cylinder and a reciprocablepiston in the pump cylinder, conduit means interconnecting thereservoir, the pump cylinder and the ram cylinder, ported and valvedmeans carried by said .pump cylinder for transferring liquid throughsaid conduit means from the reservoir to the pump cylinder, and from thepump cylinder to the ram cylinder upon reciprocation of said piston,release valve means including a valve seat formed in the base inassociation with certain of said ports and including a release valvecarried by said ported and valved means and slidable with said pumpcylinder, an annular head mounted Von the outer part of said pumpcylinder 'and through which said piston is adapted to reciprocate, andlinkage means pivotally mounted on 'said base and connected with saidhead and operable exteriorly of said base for sliding said pump cylinderparallel to its longitudinal axis for closing said release valve uponits seat.

4, In-an yhydraulic jack having a ram cylinder, a liquid reservoir and apump cylinder in the form of an elongated sleeve, a ram in the ramcylinder and a reciprocable piston in the pum-p cylinder, conduit meansinterconnecting the reservoir, the pump cylinder and the ram cylinder,ported and valved means carried by said pump cylinder sleeve fortransferring liquid through said conduit means from the reservoir to thepump cylinder, and from the pump 'cylinder to the ram cylinder uponreciprocation `of said piston, release valve means including a valveseat formed in the base in association with certain of Isaid ports saidby-pass valve means including a valve carried by said ported and valvedmeans and shiitable with said pump cylinder sleeve, and an annular headexteriorly mounted 'on the opposite end vof said sleeve and throughwhich said piston is adapted to reciprocate as Isaid pistonrecipro'cates in said pump cylinder sleeve, a pis-ton actuator pivotallymounted on said jack and connected to the outer end of said piston, andmeans mounted on said jack `and connected to said head for shifting saidpump lcylinder sleeve in a direction parallel to its longitudinal axiswhile holding said pump cylinde-r sleeve from rotation for closing saidrelease valve upon itsseat.

5. An lhydraulic Ajack comprising a base having liquid passages therein,means providing a ram cylinder and a liquid reservoir for said base, aram in said ram "cylinder, said base having a bore formed with anVenlargement at its mouth in the upper part 'of the base, a pumpcylinder in the form of an .elongated sleeve mounted in said bore andprojecting beyond said base, packing means in the enlargement of saidbore eX- teriorly of said sleeve, means connected with the base aroundsaid bore enlargement for holding said packing means compressed againstsaid cylindrical pump sleeve while permitting movement ci saidcylindrical pump sleeve parallel to its longitudinal axis, a pump piston`reciprocal in said pump cylinder sleeve, said base at the centralportion of the bottom of said bore being provided with a valve seat inassociation with certainv of said liquid passages of said base, a portedvalve cage disposed in said bore and located between said valve seat andthe end of said pump sleeve, the lower portion of said cage being formedas a release valve to close upon said valve seat, an' annular headconnected to the outer end of said pump cylinder sleeve and throughwhich said pump piston is adapted to reciprocate as it reciprocates insaid cylindrical pump sleeve, packing means in said head about saidpiston, means for compressing said packing means between said head andsaid piston, a piston actuator pivotally mounted on said jack andpivotally connected to the outer end of said piston, and linkage meanspivotally connected with said head and pivotally iounted on said jackfor shifting said pump cylinder sleeve in a direction parallel to itslongitudinal axis while holding it from turning.

6. A high pressure pump cylinder and release valve assembly forhydraulic jacks comprising an elongated metallic cylindrical sleeve ofuniform cross section or diameter throughout its length, the inner wallof lsaid sleeve having a polished metal nish, a separate cylindricalcage telescopically fitting into one end of said sleeve, said cagehaving at least two ports therethrough, one of said ports openingontofopposite'ends of said cage and the other port opening onto one endof the cage and also onto the circular periphery of said cage, valves insaid cage for controlling said ports, said cage having a conicallyshaped nose attached to its free end, said nose having a port disposedcentrally of the conically shaped outer walls of said nose, said portconnecting the outer end of said nose with one of said passageways insaid cage, the outer walls of said cage and nose lying wholly within theperipheral or outer plane of said cylindrical sleeve, the outer wall ofsaid cylindrical sleeve being smooth from the end carrying said cage forthe major portion of the length of said sleeve to provide a slidingsurface to slide in a bore in the jack. v

7. An hydraulic jack comprising a relatively low basal casting having acentrally `disposed well and a concentrically surrounding shoulderportion around said well, said shoulder portion being internallythreaded, the upper portion of said base concentrically about saidthreaded portion being provided with a laterally extending wall and anupper shoulder providing a second horizontally extending wall and athird upstanding shoulder, a cylindrical tube externally threaded andengaging the internal threads of said threaded portion surrounding saidwell to provide a ram cylinder, a ram in said cylinder, a sleeve havingits lower end seated upon the horizontal portion just within said lastmentioned shoulder and press tted and welded thereto to form areservoir, a head interconnecting the outer ends of said tube and sleeveto close said reservoir at the top, said head having a passage to permitthe projection of said ram therethrough, said base having a boreextending at an angle to the central longitudinal axis of said ramcylinder, the bottom ofv `said bore being formed as a valve seat, saidvalve seat having a centrally disposed conduit therein formedconcentrically with the axis of said bore, said base having formedtherein a passage connecting the reservoir with said. bore, a pumpcylinder slidable in said bore, a combined ported and valved unit in thebottom of said bore and operably carried by said pump cylinder, thelower portion of said unit being'formed as a release valve to close uponsaid seat, a piston slidable in said pump cylinder, means for operatingsaid piston, means for sliding said pump cylinder parallel to itslongitudinal axis, and a port formed in said base connecting said wellwith the port formed concentrically at the axis of said valve seat, ageometric projection' or the Walls of said last named port passes abovethe topmost portions of said basal casting whereby before said cylinderis assembled on said basal casting said last named port can be drilledfrom the top of said base diametrcally through said well into said portthat lies along the central axis of said bore in said base.

8. An hydraulic jack comprising in combination a base, concentric ramand ram cylinder means upstanding from said base, means on said baseproviding a reservoir, said base having a pump cylinder bore provided atits bottom with a release valve seat, conduits formed in said baseinterconnecting said pump cylinder bore, said release valve seat, saidram' cylinder, and said reservoir, a high pressure pump cylinder sleeveslidable in said pump cylinder bore and having an outer portionprojecting beyond the exterior wall of said base, an actuator rigidlyconnected to that portion of said pump cylinder sleeve which projectsoutside of said bore, said pump cylinder sleeve having an inner endyportion the wallsl of which form a release valve to close upon saidreiease valve seat, said inner end portion of said pump cylinder sleevehaving an internal liquid passage therethrough connecting with theinterior of said pump cylinder sleeve, valve means controlling saidpassage to permit liquid to flow therethrough only from said pumpcylinder to said ram cylinder, said' end portion having a second conduittherein connecting the interior of said pump cylinder with saidreservoir, valve means allowing liquid to lloiv through said secondconduit only from said reservoir to said pump cylinder, a pistonreciprocable in said pump cylinder sleeve, an actuator for said piston,and means for imparting rectilinear movement to said actuator to causeit to slide said pump cylinder sleeve in the bore of said base toposition said release valve carried by said cylinder onto its seat.r

9. An hydraulic jack comprising in combination a base, concentric ramand ram cylinder means upstanding from the base, means associated withsaid base providing a reservoir, said base having a pump cylinder bore,said bore adjacent the bottom portion thereof being formed with arelease valve seat and a connected passageway connecting with the ramcylinder, said bore likewise having a passageway connecting with thereservoir, a high pressure pump cylinder slidably mounted in said boreand being provided on its lower end with walls forming a release valvethat are adapted to seat upon and close oiT the release valve seat, saidpump cylinder being formed above said release valve portion with a portone end of which is constantly in communication with the passagewayleading to the reservoir s and the other end of whichpassagewayleads tothe interior of the pump cylinder, said last mentioned passageway havinga valve seat therein and a valve for closing upon said seat in a mannerto permit liquid to pass from said reservoir through said passageway towithinl the cylinder, but not reversely, said pump cylinderhavinganother liquid passageway therethrough adapted to connect the interiorlor the pump cylinder with the passage in the base leading to the ramcylinder, a valve seat in said last mentioned passageway and a valve iorallowing liquid to pass from said pump cylinder through said passagewayto said ram cylinder, but not reversely, a piston reciprocable in saidpump cylinder, said pump cylinder projecting outwardly of said borebeyond the exterior walls of said base, an actuator rigidly connected tothat part of the pump cylinder projecting beyond said base, and meansfor moving said actuator to slide said pump cylinder inwardly relativelyto said base to seat the release valve upon the valve seat.

10. An hydraulic jack comprising in combination a base, concentric ramand ram cylinder means upstanding from the base, means associated withsaid base providing a reservoir, said base having a pump cylinder bore,said bore adjacent the bottom portion. thereof being formed with arelease valve seat and a connected passageway connecting with the ramcylinder, said bore likewise having a passageway connecting with thereservoir, a high pressure pump cylinder comprising an alongated sleevehaving a smooth outer wall, said sleeve being slidably mounted in saidpump bore, a piston reciprocable in said sleeve, a collar rigidlyconnected to the outer end of said sleeve through which said pistonreciprocates, a lever pivotally mounted on said base and pivotallyconnected to said collar, and means for actuating said lever to slidesaid sleeve inwardly of said bore, the lower end of said sleeve havingfitting therein a ball valve cage and the lower end of said ball valvecage having connected thereto a cap having a conical outer wallproviding a release valve adapted to seat upon and close said releasevalve seat, said cap having a central passageway extending therethrough,said ball valve cage having two passageways, one of which connects thepassageway of the cap with the interior of the sleeve, a vaive seat insaid passageway and a ball seatable thereon and disposed between saidvalve seat and the cap, the other passageway in said cage having one endconnecting with the interior of the sleeve and the other end of saidpassageway terminating laterally of said sleeve and constantlycommunicating with the passageway inr the bore that connects with thereservoir, a seat in said last mentioned passageway and a ball seatablethereon., and means to reciprocate said piston.

11. An hydraulic jack comprising in combination a relatively shallowbase having a well formed in its upper surface, said base about saidwell being countersunk and provided with an upstanding circular shoulderconcentrically surrounding said countersunk portion, a ram cylindertting to the walls of said well interiorly of said countersunk portion,and a sleeve concentrically surrounding said ram cylinder and itting tothe upstanding circular shoulder, a ring-like cap closing upon the outerends of said ram cylinder and sleeve to form a liquid-holding reservoirbetween the countersunk portion, the ring-like cap, the ram cylinder,and the sleeve, a ram in said ram cylinder, said base having a boreformed therein laterally of the reservoir and inclined with respect tothe longitudinal axis of the ram cylinder, the

10 bottom of said bore being formed with` a valve seat anda passagewaylocated "c,`,entrall y`'olfA said seat, said base having a pair1- ofpassageways formed in itsY walls, one of said passagewayscorinecting--with the passageway formed centrally of the seat in thebottom'of said bore', said lastmentionedv passageway -being-inclinedupwardlyand connectingfwith the well, a'geometric projection ofthe-walls' of said last mentioned passageway passes above thecountersunk portion oi the base and above the surrounding upstandingshoulder of the base whereby said passageway may be drilled when the ramcylinder and sleeve are removed, the second of said passagew-ays beingvformed in the base at an angle to said bore and connecting at its lowerend with the bottom of said bore in said base and at its upper end withthe reservoir, a high pressure pump cylinder slidably mounted in saidbore and provided at its lower end wtih a valve cage, the lower portionof said valve cage carrying a conical nose, the walls of which areadapted to seat upon the walls of said valve seat formed in the bottomof said bore, said cage and nose being suitably ported and having valvestherein interconnecting the rst and second pasasges with the interior ofthe pump cylinder sleeve, a piston slidable in said pump cylindersleeve, means `for reciprocating said piston, and means on the base forslidably adjusting the pump cylinder sleeve with respect to the bore topermit the nose to be moved onto and away from the valve seat in thebore.

12. In' an hydraulic jack having a base provided with a bore, said basehaving thereon a ram cylinder, a liquid reservoir associated with thebase, a pump cylinder comprising a sleeve of substantially uniform crosssection throughout its length and having a smooth exterior slidable insaid bore of said base, a ram for the ram cylinder, a piston reciprocalin the pump cylinder sleeve, conduit means in the base interconnectingthe reservoir, the pump cylinder and the ram cylinder, ported and Valvemeans carried by the pump cylinderv sleeve for transferring liquidthrough said conduit means from the reservoir to the pump cylinder andfrom the pump cylinder to the ram cylinder upon reciprocation of saidpiston release valve, means including a valve seat formed in the base inassociation with certain of said ports and including a release valvecarried by said ported and valved means and shiftable with said slidablecylinder sleeve and ported valve means, and actuated means connected tothe outer end of said pump cylinder sleeve at a point beyond the outerend of the bore in the base when said sleeve is in its innermostslidable position therein for sliding said sleeve in a directionparallel to its longitudinal axis and in a direction toward the Valveseat and the baseto close the release valve upon its seat, said actuatedmeans including mechanism whereby on release of said actuated means thepressure below said pump cylinder will freely slide said cylindricalsleeve outwardly to release the pressure therein back into the reservoirthrough certain of said ports.

JOSEPH J. MUELLER.,

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 849,147 Lewis Apr. 2, 1907 (Otherreferences on following page) Number Number 12 Name Date Lindsay Sept.1, 1936 Brunder Apr. 22, 1941 Nilsen Aug. 26, 1941 Gest et a1. Nov. 11,1941 Cole May 12, 1942 Colwell et al May 19, 1942 Kirkland L June 27,1944

